Dustless anvil block



G. G. TUTTLE DUSTLESS ANVIL BLOCK Filed June 20 1925 Y U e Z l atented July 27, 1925.

1.59am PATENT orrrca.

GROVER Gr. TUTTLE, 0F PI-IILLIPSBURG, NEW JERSEY, ASSIGNOR TO INGERSOL'L-RANIJ COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DUSTLESS ANVIL BLQCK.

Application filed June 20, 1925.

This invention relates to fluid actuated rock drills, but more particularly to the percussive element of rock drills of the hammer type.

In the operation of rock drills of the hammer type, considerable wear on the percussive element is caused by minute particles of drill cuttings which are drawn into the interior of the drill. This is more particularly the case in rock drills of the stopertype, and is due chiefly to the fact that this type of drill is used mostly for drilling above the horizontal. position,, some of the cuttings settle around the end of the front head and are drawn into the interior of the drill by the reciprocatory movement of the drill steel. The dust thus drawn into the drill eventually finds its way into the percussive element and shortens the life of these parts considerably through wear caused by its abrading action.

It is accordingly an object of this invention to prevent the admission of dust or drill cuttings into the percussive element of a rock drill.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combinations of elements, features of construction and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claim and illustrated in the accompanying drawings, in which Figure 1 is a view in elevation and partly in section of a rock drill constructed in accordance with the practice of the invention,

Figure 2 is an enlarged detail view in section of the front end of a rock drill, and

Figure 3 is a View similar to Figure 2 showing a modification of the invention.

Referring to the drawings and more particularly to Figure 1. the invention is shown embodied in a rock drill of the stoper type, in which a cylinder A, a front cylinder washer B and a front head G are held in position by spring pressed side bolts D. Disposed within the cylinder A is a reciprocatory hammer piston E, only the front end of which is shown, for delivering blows of impact to an anvil bloc-k F and which blows are transmitted by the anvil block to a hollow drill steel G- inserted in the front head C.

To the end that the drill may be advanced With the drill in this Serial No. 38,471.

as the drill steel Gr penetrates the work, the drill is provided with a feeding element, comprising in this instance a feed cylinder II and a feed rod J which carries at one end apiston head (not shown) and at its outer end a pointer II for engaging the rock.

Any suitable means may be provided for rotating the drill steel in the drill hole. In this instance manual rotation is indicated. The drill is accordingly provided with arotation handle L secured to a back head 0 and has a grip portion P adapted to be grasped by the operator for rotating the drill and drill steel as a unit. A nut Q, screwed to the end of the handle L serves to hold said handle against endwise movement and also against rotation with respect to the back head. In this instance the cylinder A, the back head 0 and the feed cylinder H are clamped securely in relative position by bolts R.

Motive fluid for actuating the piston E and the feeding elementis supplied to the drill through a suitable connection S. The distribution of motive fluid to the cylinders is controlled by a suitable throttle valve (not shown) preferably arranged in the back head 0 and has a handle P whereby the throttle valve may be manipulated.

In accordance with the practice of the i11- vention, the anvil block F, which in this instance is adapted to reciprocate within the front cylinder washer B, is provided with a cap U. The cap U is preferably of considerably larger diameter than the body portion of the anvil block to overlap the bore of the washer B and in this instance extends into a recess W formed in the rearward end of the front head C and of larger diameter than the cap U. The impact face of the.

anvil block F is formed convex as indicated at X so that any dust or other abradant which may find its way into said recess may be conveniently and effectively deflected toward outlet openings formed in the wall of the front head C, and through which said dust may again pass to the atmosphere. The washer B extends into the front head to a point substantially in line with the. rearward edges of the outlet openings so that there is no obstruction for the passage of the cuttings through the openings.

In order to prevent the cap U from striking against the face V of the washer B, the stem Z of the anvil block F is provided with a reduced rearward extension 6 to form a shoulder a. A shoulder a? is formed in the Washer B and forms a seat for the shoulder 0 of the anvil block F. Ihe shoulders 0 and (Z of the anvil block F and the washer B. respectively are so arranged that when they contact a slight clearance exists between the cap U and the face V.

In the modification shown in Figure 3 the stem Z of the anvil block F is of a uniform diameter throughout its length, and the cap U is adapted to rest upon a raised sheet 6 formed on the face Vof the washer B. By thus raising the seat 6 any dust which enters the recess VJ may drop to the face V, and since the seat 6 is raised the lodgment of such dust upon the face of said seat will be prevented.

The above described invention is unusually efficient in operation and may be cheaply manufactured, and the parts comprising the percussive element of a rock drill are capable of rendering a longer period of service as compared with similar parts in rock drills which are not provided with this feature.

I claim:

In a fluid ac-tuated'rock drill,the combination of a cylinder, a front headhaving a recess and a plurality of outlet openings near its'rearward end, a front cylinder washer interposed between the cylinder and the front head andhaving a hollow bore, said washer extending into the front head to a point in line with the rearward edges of said outlet openings, an anvil block slidahle in said washer, a cap on said anvil block lying in the recess and overlapping the hollow bore of said washer for preventing the admission of drill cuttings into said bore, said cap being of smaller diameter than the recess and having a convex face for directing; such cuttings toward the said outlet openings.

In testimony whereof 'I-have signed this specification.

GTE-OVER e. Turner. 

